Method for regulating paralleled alternators in order to distribute reactive load

Patent metadata

Field	Value
Publication number	US-11233399-B2
Application number	US-201816480729-A
Country	US
Kind code	B2
Filing date	Jan 29, 2018
Priority date	Feb 3, 2017
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

Method for regulating a bank of alternators comprising at least two alternators that deliver their output in parallel to a load (C), said alternators each being provided with a regulator (12, 13) that is configured to deliver an output signal representative of the reactive power level of the corresponding alternator divided by its nominal reactive power, and a control law allowing the reactive power level of the alternator to be modified depending on an input signal, method wherein a weighted signal employed as the input signal of these regulators is generated from the output signals representative of the reactive power level of each of the alternators, i.e. the signals delivered by the corresponding regulators, so as to make each of the alternators converge to a predefined reactive power level (Trp).

First claim

The invention claimed is:

1. A method for regulating a bank of alternators comprising at least two alternators that deliver their output in parallel to a load, said alternators each being provided with a regulator configured to deliver an output signal representative of a reactive power level of a corresponding alternator divided by its nominal reactive power, and a control law allowing the reactive power level of the alternator to be modified depending on an input signal, the method comprising:
generating a weighted signal from the output signals delivered by the corresponding regulators, and
receiving the weighted signal as the input signal to the regulators so as to make each of the alternators converge to a predefined reactive power level.

2. The method according to claim 1 , the weighted signal being the arithmetic mean of the output signals representative of the reactive power level of each of the alternators.

3. The method according to claim 1 , a new voltage setpoint being calculated by each regulator depending on a discrepancy between the current reactive power level and the level corresponding to the input signal, this new voltage setpoint allowing the reactive power level of the alternator to be shifted in order to bring it closer to the predefined reactive power level.

4. The method according to claim 1 , the output signals being weighted in an analog manner.

5. The method according to any of claim 1 , the output signals being weighted in a digital manner.

6. A bank of alternators comprising at least two alternators that deliver their output in parallel to a load, said alternators each being provided with a regulator configured to deliver an output signal representative of a reactive power level of a corresponding alternator divided by its nominal reactive power, and a control law allowing the reactive power level of the alternator to be modified depending on an input signal,
the regulators receiving as the input signal a weighted signal generated from the output signals representative of the reactive power level of each of the alternators so as to make each of the alternators converge to a predefined reactive power level.

7. The bank according to claim 6 , each alternator delivering its reactive power level via an analog output configured to deliver a voltage.

8. The bank according to claim 7 , the input of each regulator being configured to receive a voltage.

9. The bank according to claim 7 , the output signals being weighted by an analog centralization circuit.

10. The bank according to claim 9 , the centralization circuit joining at a common point connected to the analog inputs the various analog outputs coming from the regulators using resistors.

11. The bank according to claim 6 , the output signals being weighted by a digital centralization circuit.

12. The bank according to claim 11 , the centralization circuit being an external system of programmable-logic-controller type.

13. The bank according to claim 11 , each regulator delivering the reactive power level of its alternator over a digital communication bus.

14. The bank according to claim 13 , the centralization circuit reading the reactive power level of each regulator, determining a weighted signal and sending it to each regulator via said digital communication bus.

Assignees

• Leroy Somer Moteurs

Inventors

• Morisseau Vincent
• Fratani Jérémy
• Moser Samuel
• Paillou Jean-François

Classifications

• H02J3/1885 Primary

  using rotating AC generators, e.g. synchronous generators · CPC title

• H02J3/16 Primary

  by adjustment of reactive power · CPC title

• H02J3/46

  Controlling the sharing of generated power between the generators, sources or networks · CPC title

• H02P2207/05

  Synchronous machines, e.g. with permanent magnets or DC excitation · CPC title

• Y02E40/30

  Reactive power compensation · CPC title